public class btest66 {
    private btest66(){
    }
    public static String printArray(int[] arr){
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i = 0; i < arr.length; i++) {
            if(i == arr.length-1){
                sb.append(arr[i]);
            }
            else{
                sb.append(arr[i]).append(",");
            }
        }
        sb.append("]");
        return sb.toString();
    }
    public static double getAverage(double[] arr){
        int sum = 0;
        for (int i = 0; i < arr.length; i++) {
            sum += arr[i];
        }
        return sum / arr.length;
    }
}
